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The BMC Cannot Identify Hard Disks When an RH2285 Is Configured With LSISAS 1068E Cards

Publication Date:  2015-06-18 Views:  103 Downloads:  0
Issue Description
1.  Log in to the baseboard management controller (BMC) Web UI for the RH2285, and choose System Information > System Status. The system displays that the disk cannot be detected.



2.  Choose System Information > Hard Disk Monitoring. The system displays that the disk cannot be detected.



3.  Hard disk information is displayed in the basic input/output system (BIOS).

Handling Process
SAS cables are not connected properly after you open the shelf cover. The correct cable connections are as follows: When you view the RH2285 from the front to the rear, cable connections are "left top and right bottom". That is, ports (port 0 to port 3) on the left of the RAID controller card correspond to the ports on the top of the backplane; ports (port 4 to port 7) on the right of the RAID controller card correspond to the ports at the bottom of the backplane. However, the onsite RH2285 adopts the "left bottom and right top" cable connections.

Root Cause
The RH2285 management system uses a low-speed signal cable of the master MiniSAS cable to obtain the backplane information, including the backplane logic version and the presence status of hard disks. If MiniSAS cables are not connected properly, the corresponding management cable channels are incorrectly connected, and the BMC cannot identify the hard disk status.

The BMC cannot read the hard disk information because MiniSAS cables are connected reversely.
Solution
Exchange the two MiniSAS cables connected to the 1068E card or the hard disk backplane. In this way, the BMC can display the hard disk information properly.
Suggestions
Open the BIOS or 1068E configuration interface, and check whether hard disks are normal.
  • If yes, exchange MiniSAS cable connections.
  • If no, remove and reinstall the 1068E card, MiniSAS cables, and hard disks.
Note:
The RH2285 is configured with one LSISAS 1078 card, one expander backplane, and two SATAs, and MiniSAS cable connections are exchanged. In this way, the BMC can display the hard disk information properly.

END